About the Author: (from TheAmerican Mathematical Monthly, vol. 93 (1986)) Jacob Korevaar has worked in complex analysis and approximation theory, including Tauberian theorems and Muntz-type approximation. Born and educated in the Netherlands, he became an admirer of Hardy-Littlewood-Pólya-Szegö-Wiener. He has spent 25 years in the U.S., mostly at the University of Wisconsin (Madison) and the University of California (San Diego). Since 1974 he has been a professor at the University of Amsterdam and a member of the Netherlands Academy of Sciences; he holds as honorary degree from the University of Gothenburg. Mathematics is a family interest (the father-in-law story applies), as are music, languages and mountain hiking.